| 发明名称 |
IMPROVEMENTS IN OR RELATING TO SECURITY OF DOCUMENTS |
| 摘要 |
A method of manufacturing paper comprises the steps of forming a watermark in a primary surface of a layer of a paper substrate (12) and forming a watermark in a secondary surface of said layer of the paper substrate. |
| 申请公布号 |
EP2697423(B1) |
申请公布日期 |
2016.03.16 |
| 申请号 |
EP20120719792 |
申请日期 |
2012.04.16 |
| 申请人 |
WOOLLARD AND HENRY LTD. |
发明人 |
BOWDEN, FREDERICK JAMES |
| 分类号 |
D21F9/04;D21F1/44;D21F11/00 |
主分类号 |
D21F9/04 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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